A navigation menu model

menu.scala

object menu extends App {
  val admin = NavItem("Admin", Some("http://www.gilt.com/admin"))
                .addChild("Sale", None)
                .addChild(
                    NavItem("Product", Some("https://admin.gilt.com/product/"))
                      .addChild("Edit Product", Some("https://admin.gilt.com/proudct/edit/2123"))
                )


  println(admin)
}

trait NavMenuElement {
  val label: String

  val url: Option[String]

  val children: List[NavMenuElement]
}

object NavItem {
  def create(label: String, url: Option[String]) = NavItem(label, url)
}

case class NavItem(
          override val label: String,
          override val url: Option[String],
          override val children: List[NavItem] = List()) extends NavMenuElement {
  def addChild(childLabel: String, childUrl: Option[String]) = copy(children = children :+ NavItem(childLabel, childUrl))
  def addChild(childItem: NavItem) = copy(children = children :+ childItem)
}

case class NavMenu(items: List[NavItem])